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PROBASE is a population‐based, randomized trial of 46 495 German men recruited at age 45 to compare effects of risk‐adapted prostate cancer (PCa) screening starting either immediately at age 45, or at a deferred age of 50 years. Based on prostate‐specific antigen (PSA) levels, men are classified into risk groups with different screening intervals: low‐risk (<1.5 ng/ml, 5‐yearly screening), intermediate‐risk...
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